block: factor out a bvec_set_page helper
[ Upstream commit d58cdfae ] Add a helper to initialize a bvec based of a page pointer. This will help removing various open code bvec initializations. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20230203150634.3199647-2-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk> Stable-dep-of: 1f0bbf28 ("nvmet-tcp: pass iov_len instead of sg->length to bvec_set_page()") Signed-off-by: Sasha Levin <sashal@kernel.org>
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